It's the beginning of the end for IE, now the US government are strongly advising people to switch to alternative browsers:
http://www.wired.com/news/infostruct...,64065,00.html
http://slashdot.org/article.pl?sid=0...&tid=95&tid=99
Note that Avant and MyIE are still using the Trident(IE) rendering engine so still have the same vulnerabilities.